Electrode for electric batteries, electrolytic cells, and the like



" rod within the anodebv a rodiof silicon iron Patented July 1931 UNITED STATES PATENT OFFICE LEONARD ANGELO LEVY. OF LONDON, ENGLAND, ASSIGNOR TO EEES, LIMITED, 0]

- LONDON, ENGLAND ELECTRODE FOR ELECTRIC BATTERIES, ELECTROLYTIC CELLS, AND THE LIKE no Drawing. Application filed August as, 1929,

This invention relates to electrodes for electric batteries, electrolytic cells and the like and has for its object to provide improved electrodes which are practically unattacked by the electrolyte or products with which they are associated.

The invention is particularly applicable in connection with electric cells of the kind wherein a halogen or halogens is or are evolved at one or other of the electrodes during operation, one of the difficulties having been hitherto to provide an anode which is substantially or is entirely unattacked by lralo ns evolved in the nascent state during the c arging of secondary cells'of this type.

In carrying the invention into efiect in one form by waypf example I'provide an electric cell constructed on the lines set out in British application No. 12,385 of 1928, Patent No. 320,916, except that I replace the carbon alloy, the amount of silicon employedbemg about 14 to 15 per cent.

Not all silicon iron alloys of the above percentage content are efiective' in giving adenate anti-corrosive properties under conditrons arising in such cells and reference should be made to the micrographic structure in order to select alloys yielding the desired results.

In suitable silicon iron allo 5 according to the present invention themicrogra hic aparance (at 500 diameters magni cation) indicates a condition of silicon 'iron solid solution containing considerable proportions of graphite in the form ofcurved plates and small masses which are not 'well defined in photographs taken at lower magnifications. Having now described my invention, what I claim as new and desiretosecur'e by Letters Patent 1s An' electrode for galvanic cells composed of a silicon iron alloy containing about14 to 15 r cent. of silicon and havin a micrographic structure which at 500 egrees of Serial No. 888,625, and in GreatIBrltain vScptemlierfll, 1928.

magnification indicates a condition of silicon iron solid solutioncontaining considerable proportions of raphite in the form of curved plates and small masses.

In testimony whereof I have signed my name to this specification.

LEONARD ANGELO LEVY. 

